Im pretty sure that a lot of the methods you all talkk about, I use, but I have no idea what they are called

9:31 am

chrissie2006

cross hatching i can figure out, but i have no idea what region intersection analysis is

9:32 am

UDbmas

ditto... I just go through the same sequnce every time to fill in what I can... I think the 4 things I do first fall into what seems to be called "scanning"

9:33 am

UDbmas

And I think I know what "naked pairs" and "naked triplets" are

9:34 am

chrissie2006

I don't... :)

9:36 am

UDbmas

if you use "greens" look for two squares that have only 2 possible numbers, then look at the squares that are in the same row, column or block to see if there is a second square that has the same 2 only possible numbers. I think that is a "naked pair" and triplets are the same, only there are 3 possible numbers

9:37 am

UDbmas

If you find a naked set, then all other squares in that row, column or block cannot be those 2 (or 3) numbers, so you can erase those greens.

9:41 am

brittlefish.com

go

9:42 am

chrissie2006

oh ok, Yeah I do use that too, just never had a name for it

9:44 am

UDbmas

I have no clue about some of the others, even after I go to a site that explains it...like x-wing or y-wing... :-|

9:44 am

chrissie2006

I havnt even heard of those

9:44 am

UDbmas

PS: Hi Canada!

9:46 am

brittlefish.com

http://www.brainbashers.com/sudokuxywing.asp

9:48 am

brittlefish.com

xy wing is pretty simple if you can find them

9:50 am

UDbmas

That's about when my brain starts leaking out through my nose...

9:50 am

brittlefish.com

:)

9:53 am

UDbmas

done... take care all & have a good one...

9:54 am

brittlefish.com

see ya

10:03 am

brittlefish.com

done

10:03 am

brittlefish.com

kind of a slow medium

10:26 am

btwrt

took me 20 minutes or so. not bad :D

12:46 pm

yul

btwrt! happy new year

12:57 pm

gman

drwho -- guess who's hot and right behind you in ranking??! OK, don't take it personnal; hee, hee! I know you can use your programming skill to get to 600 overnight. overnight.

2:09 pm

helenkeller

go

2:21 pm

helenkeller

done

2:31 pm

Stephanie

go

2:45 pm

Stephanie

done

3:09 pm

drwho

chrissie2006 -- region intersection analysis is a little more general than what UDbmas describes. It is a generalization of the pointing pair and box/line reduction techniques described at scanraid.com.

3:11 pm

drwho

If you focus on the intersection of a 3x3 block and an line or column, the 3 cells they have in common are significant. If a digit is limited to those 3 square or any 2 of the 3 in the row, then it must be limited to the same 2 or 3 squares in the block and vice-versa.

3:14 pm

happyhammer1982

go

3:14 pm

drwho

gman -- I hear the sound of hooves and heavy breathing.

3:14 pm

happyhammer1982

go

3:14 pm

happyhammer1982

go

3:14 pm

happyhammer1982

go

3:14 pm

happyhammer1982

go

3:27 pm

aki2403

done :D

3:28 pm

aki2403

6 points away from being in the regulars end of next week if my calculations are right *dances*